KWallet, SecretService, oo7: the story so far

Continuing previous efforts to update the “secure passwords” story of the Plasma desktop, I’ve done some integration work between Plasma and oo7.

Oo7 is a relatively recent SecretService provider written in Rust; it’s very nice, lightweight and cross-desktop. Very interesting for us supporting it as a first class citizen.

We want in the end to replace completely the old KWallet system with something based on SecretService, have all our applications migrated transparently with user data as well, if possible with a cross-desktop backend implementation.

We also want it to be as transparent as possible for the end user, not having any complicated first time setup, or dialogs that ask for a manual unlock when not needed. For the user, the whole system should be just invisible, except when looking up their passwords or when client applications add passwords to it themselves.

As a first thing several months ago we did a transparent translation layer for the KWallet DBus interface, so now the “KWallet” service became just a translation layer between the kwallet api and the secretservice one.

The old kwalletd service instead became “ksecretd” now providing only the SecretService interface, and that’s what we use by default now. however, it can be configured to use a different provider, so it can already be used with gnome-keyring or KeepassXC if the user wishes. In that case the user data will be migrated the first time.

Also I’ve written a new application called KeepSecret. It is centered around SecretService, with a much more modern UI compared to KWalletManager and works also much better on mobile, so we can have also a modern password manager on Plasma Mobile.

The last thing that we did so far is integration with a new SecretService provider on the block: oo7.

If oo7 is Just another SecretSerive provider, Won’t it “just work” in Plasma? Not quite, but that’s actually a good thing. Oo7 wants to properly integrate with the environment it runs in, so we need to build that integration.

When you use KWallet, KeepassXC, or gnome-keyring directly, they create their own password dialogs using their own toolkits and styles, therefore potentially looking a bit alien when run in a different environment than the one it it was designed for.

This is not ideal for evaluating options for a possible future replacement of KWallet (which piece by piece we are working towards), as we want the UI part completely integrated with the Plasma desktop.

Instead, oo7 is built on the assumption that the environment it runs on will provide its own dialogs, a bit like the portal system for services like screen sharing and file picking.
This requires active integration both on the Plasma part and the oo7 part, but on the other hand it will look native on Plasma, Gnome, and any other platform that implements the integration hooks. And that’s with the added benefit of sharing the password storage if someone every now and then goes desktop environment hopping.

On the Plasma side we decided to employ a very small daemon which is launched only on demand with dbus activation. It will create the needed system dialogs, pass the user input back to oo7 and then quit when not needed anymore, so it won’t constantly use up system resources.

This is already available in Plasma 6.6: the code for it is here. It’s designed first for oo7, but it can be used by any daemon which wishes to provide native password dialogs, so we might start to use it also from other components in the future, either other SecretService providers or completely different things which have similar needs like Polkit.

On the oo7 part, Harald implemented the integration with its dbus interface, so with oo7 from main branch (or its next release) it can be used in place of KWallet (with all old applications still using the KWallet API using its backend as well), with all data migrated to it, and it will show native UI for its password dialogs… all the pieces of the puzzle slowly falling together

Needless to say this is still at an experimental stage, but it’s an important milestone in getting more independent from the aging KWallet infrastructure.